Leather-staking machine.



No. 681,909. Patented Sept. 3, l90l, T. DAWSON.

LEATHER STAKING MACHINE.

(Application filed Jun. 2, 1901.)

(No Model.)

2 Shaets-Sheet I.

\AAT'IJEEEEE- Patented Sept. 3,1901.

T.' DAWSON. LEATHER STAKING MACHINE.

(Application filed Jan. 2, 1901.)

2 Sheets-Sheet 2.

(No Model.

.||tll.llB|||||lIl| llllxlll UNITED STATES Qreee;

T NT THOMAS DAWSON, OF SALEM, MASSACHUSETTS, ASSIGNOR, BY MESNE AS-SIGNMENTS, TO DENNIS W. MURPHY, OF BEVERLY, MASSACHUSETTS.

LEATHER-VSTAKING MACHINE.

SPECIFICATION forming part of Letters Patent No. 681,909, datedSeptember 3, 1901.

Application filed Januarv 2, 1901. Serial No. 41,883. (No model.)

To aZZ whom it may concern: 7

Be it known that LTHOMAS DAWSON, of Salem, in the county of Essex andState of Massachusetts, have invented certain new and usefulImprovements in Leather-Staking Machines, of which the following is aspecification.

This invention has relation to machines for treating or working uponhides, skins, and leather, and it has more particular relation to thatclass of machines which are employed for softening the materialsmentioned. Such machines usually comprise two cooperating members, oneof which carries a roll and the other of which carries one or morestaking or softening knives or blades, the members being arranged andoperated whereby when the hide or skin is placed between the roll andthe blades and the members are reciprocated said members are alternatelyopened and closed, being opened during their forward movement and closedduring their rearward movement, so that the knives and rolls serve toengage and soften the leather as they are moved rearward.

One object of the present invention is to provide a leather-stakingmachine with improved means for providing a constant support to the skinor hide undergoing treatment, this being a feature that has hithertousually I been lacking in such machines wherein the members travel backand forth through an.

7 ing so constructed and arranged as to intermittingly release the hideor skin,whereby it may be shifted laterally to permit the members toengage a fresh portion thereof. 7

Upon the drawings, to which reference may now be had, I have illustratedone embodiment of my invention.

Figure 1 represents a machine in side ele- -vation. Fig. 2 represents alongitudinal section of the same. Fig. 3 represents a plan view of themachine. Fig. 4 represents a section on the line 4 4 of Fig. 2 lookingin the direction of the arrow. Fig. 5 represents a plan view of the endportion of the frame of the machine. V

The machine is provided with the usual main frame, which consists ofside standards 10 10, connected by tie-rods 11. The side standards areelongated and their top surfaces are at a slight inclination, as shown,although this is not essential to the operation of'the machine. Each ofthe standards is provided with an inwardly-extending web 12 to receive aslide or carriage consisting of the two plates 13 13. The edges of theplates rest upon the webs or guides 12, upon which they are adapted toslide, being held in place by gibs 14, as shown. In the rear there isjournaled a shaft 15, equipped with the usual belt-pulleys 16 17, one ofwhich is fast upon the shaft and the other of which is loose. The shaftis mounted in journals afforded by the side standards. and by a bracket18, secured to said standards, and the pulleys thereon receive powerfrom a belt in the usual way. On the end of the shaft there is attacheda heavy momentum-wheel 19, which is located between the side standards,as shown in Fig. 3, said wheel being provided with a crankpin 20.. Thispin is connected to the slide or carriage by a pitman 21, the latterbeing connected by a pintle 22 with ears or lugs 23 on the plates 13.The rotation of the crankpin causes the reciprocation of the carriage inthe main frame. Upon this carriage are mounted two coacting members,which are open during the forward movement of the carriage and which areclosed during the rearward movement, said members, however, beingyieldingly mounted, so as not to injurethe hide or skin which is placedbetween them. The two members are indicated at 25 and 26, respectively.Each of the two members is in the form of a lever, that at 25 beingfulcrumed by a pintle 27 in the upwardlyprojecting ears 28 of thecarriage and thatat 26 beingfulcrumed by the pintle 29 in the carriage,as shown in Fig. 2. Theforward extremity of the member 25 is providedwith downwardly-projecting ears or lugs 30, in which is journaled a roll31, the corresponding extremity of the member 26 being provided with theblades 32 33, adapted to lie on either side of the roll 31, so that whenthe members are brought together at their outer end the hide or skinwill be depressed between the edges of the blade by the roll. The member25 likewise carries a polishing-blade 25. To the shorter rear end of themember 26 there is pivoted a link 34, which is in turn pivoted to a lugprojecting downwardly from the front or longer end of the member 25, thepintles 35 36 being located at substantially an equal distance from thepintles 29 and 27, respectively. According to this construction when thelonger end of the member 25 is depressed it depresses the shorter end ofthe lever 26 and correspondingly forces the longer end thereof upward.The pitman 21 not only performs the function of reciprocating thecarriage and the members thereon, but also serves to actuate saidmembers. It will be observed that the member 25 is bent downward'fromthe pintle 27 and then rearward, so that its end 38 projects well underthe end of the pitman. The under side of the pitman is formed as a cam37, which as the pitman oscillates about the pin 22 serves to oscillatethe member 25, and thereby the member 26. The shape of the cam is suchas to raise the front end of the member 26 when the carriage reaches itslimit of rearward movementand to depress the same when the carriagereaches the extreme of its forward movement. The cam is shownconventionally; but I do not limit myself to the exact shape which hasbeen illustrated. The cam positivelyactuates the members to open them,the closing movement of the members being efiected by spring pressure,which pressure is augmented or increased automatically. Very powerfulsprings are employed for this purpose, and they are indicated at 39. Thelowerends of the spring are attached to a pin 40, passed transverselythrough the end 38 of the member 25, the upper ends of the spring beingattached to lugs or projections '41 41, extending laterally from a lever42, pivoted by a pintle 43 on the member 25 in the rear of the pintle27. The springs serve to hold the end 38 of the member 25 yieldinglgyagainst the cam 37. In order to increase the pressure of the spring whenthe staking members are together, the pitman 21 is formed with an othercam 44, which engages the under side of the lever 42 and which mises.said lever during the rearward movement of the carriage and permits itto be depressed during the forward movement of the same. From thisdescription it will be observed that the roll 31 and the blades 32 33engage the skin with great though yielding 'ciable extent.

ging or dropping. clamping the work firmly during the rearward movementof the carriage and the operpressure. The skin or hide is placed uponthe machine and .rests upon a table 45, se-

table and also the space between the sidestandards of the frame I employa traveling flexible support 47. This may be in the form of a leatherbelt which is passed around loose pulleys 48 49, journaled in bearingsproperly located'upon the side standards. One end of the travelingsupport is connected yieldingly bysprings with the shorter end of themember 26, said springs thus constituting an elastic section of thesupport, while the other end is connected with the longer end of thesaid member, as indicated at 61. In any event the fastening screws orbolts are located as near as possible to the pintle 29, so. thatvibrations of the member 26 will not vary the tension of the travelingsupport to an appre- As shown in Figs. 2 and 3, the traveling support isprovided with an aperture 50, through which the blades 32 33 may projectinto engagement with the hide or skin. During the entire movement of thecarriage the traveling belt affords. a support for the skin or hide andprevents it from sag- To assist the operator in ating members, I employa jaw 51, which may or may not be corrugated on its under surface, asdesired. This jaw is placed upon the laterally-curved end 52 of a lever53, ful orumed in a bracket 54, projecting upwardly from one of the sidestandards at a point substantially midway of the machine. The rear endof the lever rests upon a cam 55, which is so formed as to depress thejaw 51 while the carriage is moving rearwardly and per mit it to moveupward when the carriage is moving forward. The upward movement of thejaw is effected by a spring 56, attached to the lever and to the sidestandards, respec tively. To cooperate with the jaw 51 there is astationary plate 59, which is secured upon the plate 45.

A machine constructed in accordance with the foregoing description issimple in construction and highly eflicient in operation.

The arm 42 and the cam 44 perform an important function in that theyincrease the power of the springs when the members are closed and tendto reduce the power necessary to open or separate said members, so

j that although the springs may be very strong and powerful but littlepower may be required to operate the machine. Again, the formation ofthe cam upon the pitman provides a i simple construction of themember-actuating mechanism. Thus the pitman not only reciprocates saidmembers, but likewise actu ates them.

Having thus explained the nature of the invention and described a way ofconstructing and using the same, although without "attempting to setforth all of the forms in IO 2. Aleather-staking machine havin g anoperative member, means for positively moving said member in onedirection, means for yieldingly moving the said member in the oppositedirection, and automatic mechanism for intermittingly varying the powerof the said yielding means when said member isin operative position forstaking.

3. A leather-staking machine having coacting members, means forpositively separating said members, means for yieldingly closing saidmembers, and automatic mechanism for intermittingly increasing the powerof the said closing means when said members are together.

4. A leather-staking machine having movable coacting members, connectedtogether whereby one imparts movement to the other, a revoluble crank, apitman connecting said crank with said members to reciprocate them,

0 said pitman having a cam to actuate one member and through it actuatethe other member.

5. A leather-staking machine having movable coacting members, connectedtogether 3 5 whereby one imparts movement to the other,

a carriage to which said members are pivotally connected, anoperatively-driven pitman pivotally connected to said carriage, andhaving a cam bearing against one of said members to actuate it andthrough it actuate the other member.

6. A leather-staking machine having movable coacting members, areciprocatory carriage to which said members are both pivoted,intermediate of their ends, an operative connection between the frontportion of one member and the rear portion of the other member, andmeans for oscillating one of said members whereby the other isoscillated thereby in the opposite direction.

7. A leather-staking machine having movable coacting members, a carriageto which said members are both pivoted intermediate of their ends, aconnection between the front portion of one member and the rear portionof the other member, and an operativelydriven pitman pivotally connectedto the carriage and having a cam portion to act upon one of saidmembers.

8. A leather-staking machine having movable coacting connected members,one of said members being pivoted between its ends, a carriage on whichsaid members are operatively supported, a wheel having a crankpin, apitman connecting the crank-pin with the carriage, and a cam on saidpitman which engages the rear end of the pivoted member.

9. A leather-staking machine comprising a staking member, an actuatorbearing against said member to operate it, an arm pivoted to saidmember, and one or more springs connecting the arm and the member tohold the member against the actuator.

10. A leather-staking machine comprising a staking member,an actuatorbearing against said member to operate it, a spring for holding saidmember against said actuator, and means operated by said actuator forcontrolling the tension of said spring.

11. A leather-staking machine comprising a staking member, an actuatorfor actuating it, an arm pivotally connected to said member and lying onthe opposite side of said actuator, a spring or springs connecting thearm and the member, and a cam on'said actuator for moving said arm.

12. A leather-staking machine comprising vibratory and reciprocatorystaking members and a flexible support for the work directly connectedwith one of said members and adapted to reciprocate with said membersand having a flexible yielding section to prevent the support frominterfering with the vibra-' tions of the staking members.

18. A leather-staking machine comprising vibratory and reciprocatorystaking members, a flexible support fixed at one end to one of saidmembers, loose pulleys, the said support extending around said pulleysand connected at its other end by a yielding tension device to the samemember, the said tension device enabling the member to which it isattached to vibrate without interference by the said flexible support.

In testimony whereof I have affixed m y signature in presence of twowitnesses.

Ill THOMAS DAWSON.

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